Kara DioGuardi has dismissed Howard Stern as a possible replacement for Simon Cowell on American Idol.

The songwriter said that she doesn't believe the shock jock has the musical expertise to step in for Cowell, who last month confirmed that he is leaving for the US version of The X Factor next fall.

"I don't think he has any kind of musical background," she told DS.

DioGuardi continued: "If you are going to replace Simon, you have to have that background [and be] someone who knows about signing great artists and being a part of their career from the very beginning."

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Stern recently said that he would love to fill the judging slot if he was asked.